I’m a retired teacher and no way would I go back at this difficult time. I hung up my chalk when I was 59 and retired to a life without school stresses. Personally I think 70 is too old to be dealing with young children or young people.
The loss of adequately qualified teachers in modern foreign languages, maths, and the sciences has been going on for some years now. Certainly one reason is because many students choose to study ‘easier’ degrees, and they simply refuse to enrol on science courses or language courses. The result of this is that fewer of these courses are now offered at universities. My husband, as well as teaching, was also the Examinations Secretary at the independent school where he taught, and he dealt with the universities every year as he negotiated places for his students after exam results were released. He was concerned for years that students were not choosing traditional academic courses and that these courses were consequently drying up. That is not to say that there are no academic courses and students choosing to follow them, and many courses such as medicine and the sciences remain as rigorous as they always were. Courses at the best universities also remain high in quality, but unfortunately there has been a huge dumbing down in the quality of courses offered and the quality of the teaching and learning in some of the newer institutions.
Bearing all this in mind, it is not surprising that the 70 year old teacher has been asked to go back to teaching. But if a younger person can be found, then the job should be available for a younger person. In my opinion.